IBM 6343, Hardware Maintenance Manual

Page: 9 / 230

© Copyright IBM Corp. 2001
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Chapter 1. General Checkout
This general checkout procedure is for Types 2292, 6343, 6349, 6350, 6790, 6791, 6792,
6793, 6794, 6795, 6823, and 6825 computers.
Diagnostic error messages appear when a test program finds a problem with a
hardware option. For the test programs to properly determine if a test
Passed , Failed or
Aborted , the test programs check the error-return code at test completion. See
“Diagnostics” on page 16.
General error messages appear if a problem or conflict is found by an application
program, the operating system, or both. For an explanation of these messages, refer to
the information supplied with that software package.
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1. Power-off the computer and all external devices.
2. Check all cables and power cords.
3. Make sure the system board is seated properly.
4. Set all display controls to the middle position.
5. Power-on all external devices.
Attention:
The drives in the computer you are servicing might have been rearranged or the drive startup
sequence changed. Be extremely careful during write operations such as copying, saving or
formatting. Data or programs can be overwritten if you select an incorrect drive.
Notes:
•
Types 2292, 6343, 6349, 6350, 6790, 6791, 6792, 6793, 6794, 6795, 6823, and 6825
computers default to come up quiet (no beep and no memory count and checkpoint code
display) when no errors are detected by POST.
• To enable beep and memory count and checkpoint code display when a successful POST
occurs, do the following:
1. Select Start Options in the Configuration/Setup Utility program (see “Setup Utility
program” on page 14).
2. Set Power-On Self-Test to Enhanced .
• Before replacing any FRUs, ensure that the latest level of BIOS is installed on the system.
A down-level BIOS might cause false errors and unnecessary replacement of the system
board. For more information on how to determine and obtain the latest level BIOS, see
“BIOS levels” on page 177.
• If multiple error codes are displayed, diagnose the first error code displayed.
• If the computer hangs with a POST error, go to "Symptom-to-FRU Index" on page 69.
• If the computer hangs and no error is displayed, go to “Undetermined problems” on page
107.
• If an installed device is not recognized by the diagnostics program, that device might be
defective.